[feat] Web Request Callbacks and Filtering #4899
Description
Describe the problem
Tauri should expose a way to register a Rust callback to intercept and modify requests that the application in the web view makes, as part of navigation, resource loading, or via JavaScript API calls. Election has an API to do this here: https://www.electronjs.org/docs/latest/api/web-request
Applications can use this functionality to modify requests for their needs (adding and removing headers for example) as well as preventing access to sites outside the scope of the application, for security.
Describe the solution you'd like
Electron has an API for this already that can serve as a base. Ideally, we can register two callbacks - one called with the request before it is sent and one called with the response after it is received. The callbacks should be passed the complete info about the request and response, and should be able to mutate or reject them.
Alternatives considered
Delegate requests to the core application via either IPC calls or custom protocols. This requires that the inner page be written to use them though, which is not possible for third party sites, and does not address the use case of security hardening.
Additional context
No response